Lactose Intolerance

It really sucks when you cannot eat diary.  I mean I can eat it, but I have to be inside.  The messed up part about it, is that it comes and goes.  One minute I'm indulging in a pizza slice at work and my tummy is fine and the next all hell breaks loose in my pants lol.  I just want to eat freely.  Yes there are food that I can eat that does not include lactose, but I've never heard of lactose free pizza.  If it does exist, please let me know where I can find it.  Please! I fucking love pizza!